GAS-SOLID FLOW MODELING IN A COMBUSTION CHAMBER WITH MOVING BOUNDARY

Numerical Simulation of the interior ballistic processes is a very difficult and challenging problem due to the existence of solid propellant and its products of combustion. Hence, modeling of the two phase flow is crucial to predict the interior ballistic parameters from the solid propellant ignition point till the projectile exit the gun muzzle In this work, the computational fluid dynamics for two-phase flow of the interior ballistic process is presented. The numerical simulation is carried out by MacCormack's technique depending on the governing equations of the two-phase flow. A self-adapting method is used to expand the computational domain of the projectile motion and the moving control volume conservation method is utilized to adapt the moving boundary, This approach is applied to 76 mm naval medium caliber gun with guided projectile. The simulation results of the two-phase flow model with the projectile motion give a good agreement with the experimental results. The presented model enables successful solutions of many interior ballistic problems.